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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2318066762694ffcfca32d3e4a702f6e3e219b6dc5a29dcedcb8ba2002eac28d' 
  AND token = 'P8izTF59kMgGP9IHvA/lSiqN5+k7/SbuUvWO1PhrRs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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