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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb9a9a707f7af742fa0b6b44054aae0ed545c0a12dcd65ea3deeb46ce57cfe1' 
  AND token = 'OQ2J7oEtoz7d9zn8rArXez3fiG/oeeiPG14WJ79hEgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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