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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e651645bfcab116cdb5bc02a44940e0b57eba5f760f1c10d7d5d7b865117fa' 
  AND token = 'm42HqLQs7wJkpCKP4XOiTFRxagI1BbS3pMD/dkzLnb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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