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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8773ae672448e6c8bc5ecb6d129340ee9959d9df59b16be222ebc519a6bc27db' 
  AND token = 'Nilw3Lr7mMLONCPQScoz7vd3l7FMUUREFx8Baef9o/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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