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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad92ce0ea81a4ff058f4abe6a2891a98395369d7ff7081fd1fb9f1dc184b626' 
  AND token = 'IXR2+o72/9sFcf5+QnFptHjsALJ2Afpv4Vw9MD7xkEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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