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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cf097bee0269a25c88b82e7b1411bfd7e5e7ba7096fe27cb6b09860918a240' 
  AND token = 'f28FQ1hUvhOrdKM1AUQ8JqSoyQt6mfMXUTgdvmb074M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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