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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89212e867e088a62d5b354d343964bc0248c41b597b7f7fd9b3881839eb3b82' 
  AND token = 'CUF6LC+XOb51m3aXsQIyXg3q5VaBUSBKgB+n8e4FVtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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