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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb0e7d26f618ec069986594f7fc5d7532bf94c488a5091cfdb1967e47a85545' 
  AND token = 'ewB1GGi6nqcl6yRjTeu0oXFhBUfizq3euJxVR8c1ZrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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