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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038f3a8fe7608c9ee28a1307cc30327d0b34b20435d5bce6a8791d68a4fac0fd' 
  AND token = '9cZu0uKRm1jYKBuWbI4HVmpyRt5i5QFJi/+ZOq2s9ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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