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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082df7d2fb53b24a41b39fcc5f8d8c5571a1491d24f79733d4accdbe236e9558' 
  AND token = 'p4wfigJLQwj2ByJWSqb8dDNeCFHLdk/nHW3o/yikPcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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