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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddf42bd62c109ada6ee57dfdc37d6695bf4a1a2fa29dec30da17cb74313039d' 
  AND token = 'rb//x8zk7af3HOznGe+v8VbJICWOTpPPTep8sBN/Cro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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