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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86218ddcbee5f2ad356896570378a8fb44931231eee9d976cf3ea4498ebdc4a9' 
  AND token = 'YZlCixGUrLFisdVrt4wX6Sn/QF21e2Rn91VskSW7GTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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