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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70372ff62376a4a09eca5c29531da317614eb773b2c5e9f4fd1fc6eb07362e0' 
  AND token = 'sbTr0txiqY8i/PX3WuRmHKxo4Fg87Elr76Iv3J+pbW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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