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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3608df802d42d02543f8266c9ef6a450b6a72d3fad9d0e290f085c22636d62a5' 
  AND token = 'ggZsp9HYCDAURyban+pe2LslvyN9eUUw8Zn9GF2QobM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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