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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13dca3f8385e5a7f367ca28b64e407d32db264300d263b9578905e83740f97b2' 
  AND token = '/OAzTdHzt/Gt++aAIdoCQeMFLGw3AdA4vtlK9fzblw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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