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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd23cade5c19eafbccad4e7f9dc0884ab2b627e958425cf7c81467a8de0a7d8e' 
  AND token = 'IYY/7oyqS3b8/4ZgyyOPNo3bsIU4EohYZ3elZfd347k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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