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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8842806ace625556d7a84bbcb10da5c8cc2cf5940e114c279cdfa2266caf2191' 
  AND token = 'jvPuTq9WK53VabWkGNJrDrFjqjvw4Sdc1j0zhSkONB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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