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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21430a9294a5e176036b0bf31bb1e9c9ef2174a79354dfc3abc789ef2a5a6e62' 
  AND token = '1WgSEVZE0ivVcd7LsUceTWH1WB0XZ7dFzjpHWQwgamY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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