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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda3e9bafcc62a1d78b2863c77c954c9968f72cbe5f68f7a4f269bc4830e4fd5' 
  AND token = 'Iol0BZ7G7RNICklKTInRsozuQ2WFTMk9waFG5XW0MFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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