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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a156cab22e048a4b6ebd9f836a279e62971651f1d42fa9e4f12d1296b1b606e6' 
  AND token = 'u2jyPpsgtM/grtv4Ay1KV8czeKea8hkiNAS4OcYcXqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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