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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffe3e32b8e8bf8a3711c92ca5e83d31e23cd7c58b611e31e5b8542f57ef292c' 
  AND token = 'Rpriav0yRTxNuUrAiq6yXUyFqwuP0dKiAC9VZljd9s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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