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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd87c05e7e3c6a4c5b9eee8d1f6f3f07dabb3ceeb0ba6ec68d26faa34a05ed12' 
  AND token = 'gHTgUL03angE3l07Uu/jNyKsCeGrXt1A55JXt8m7d4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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