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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d08b9229eed25b90485cf6e0993657aa3cbcfd95a5525e3d597c7e61cfea3d' 
  AND token = '/BmVVd+176pVlKkIAV1IHhqNgz1KeenRG63zR4iGpKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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