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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbd4f562f36ad633737840a26918d8f3f36ec6ff4044f35efac286e822624cc' 
  AND token = 'ay0ykq2CtOQECvPwI/SnAFBT9fNkUpsjkTbJXAigh+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}