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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bc8e6b0b1976d1b0f9afc0b0c83e16ef25fcf11ed251e57c59d6fc15947539' 
  AND token = 'vVb7vxat6qYwwFAOxRWedS4sbHfcucZZW2S5FpthKvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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