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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f16146393f34c40b4d75814e60d51a10ca0a2d523bca36c53e136cf9e9e3d8' 
  AND token = 'P4abdjTL0aV/huF94kpzJW8uOGLQWOjc9T9qKjijm+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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