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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f97c2b26a74d878f69439c963e0091800e01542e2bbd3e06ebc1e79f9675428' 
  AND token = 'MqH2Kxc5UJsmiA4nu9fhnhRqWB41alRNQMORA6F7YhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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