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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720c93a7ee2500bcb688036f5bf59783b16fa96fdb939167034fca0ce055f489' 
  AND token = 'PNG5HAA892V1yd4zANqz9eiKyYC1n76srdAb/2zUpwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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