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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae75761f98b7c30e6ba711ef8f6e0af016c0a6a1d32e9866f9592dc3b3c32ec' 
  AND token = 'abPVeeTmBLW50V4ZK+dzAm3G+mVCpCB+Ksv3bZ4B1BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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