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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2b781086cb4c8dd8a2e24a02d43bacc923bfb711be6184972198bc3cf51f9b' 
  AND token = 'q2/pL69SlJWX2IushGWQux0KFOeBn4oleAdWaFTlg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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