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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811fdb3d9c7dc29168be83313d11da798124ad30287b67c6bb811a5f4baa1a17' 
  AND token = '/k4Ph07ry21JWaz+dTXjb1+pvSDI7Ag4lVueHtHAhsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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