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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c70527a8c178923cdd63f0eff6505f3a48fa75238e65adfa5ec24f84e2e1fb' 
  AND token = 'zJLNSD8MznD40StvbxbkC1C8cnnEzQkdVmW9riRt1Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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