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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0fe5f17efc521c9ecc59e510847679040ddf72c1e7576ef9f7c9a9ae1a32d8' 
  AND token = 'y/JaJENRLbS4RzHv48PriRx0TEK01T2asnkMdenqbaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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