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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fba4dc87297e6a96b84a7fed1d7c6ccc7dca78020b243d1018aaa1c9075b46' 
  AND token = 'bCFgfXkeaFxhRhRm5ZtxEHbR+AFZo5VBUAMch+vnd5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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