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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d4dd2563d37aa33d7a72f25d687b8b752035dd3542a044a87a6b3093d8666a' 
  AND token = 'rVG42R9VNLd7Im6u2HHnABfkaikN5ep+vQMVPG5Dpos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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