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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba73cb655e8cb0c5f32f666c8c9d48c120eea0338d794fab201fd86cfd42226' 
  AND token = 'tX1sxhseDrB9AWI6R7w386hCaCCebs4sbm1LMkrd7yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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