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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db6aee26a74a172e416f43f392968841cec577eecbfce77ff48c796178bce68' 
  AND token = 'J6HgG/Jn5tA1OKlqXfHx3FWIaneiD+PIGq5yfRLr8d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00242

JSON explain

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