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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9ec80d054f21a925ad5e4ac73c1de4f9dc1f3feb0f2ca2169a14fae39536fa' 
  AND token = '8FllgrtfQ41urfeQjXfKtMKVRtkP8P1OVFPBB2nJUag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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