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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525e1c1c60c0caa15ed3b80d1f44c7b659fba2efe88df54655136b64cf43aecd' 
  AND token = '5goXbe6fO6I+dT3CRNfI4Q6P4NCiOVe8dFdGmvKUQhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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