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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ecf833f9780fd779f5f9ab44cd0a23d3ea26333a94b1f04e212d3c46d8e1d2' 
  AND token = '7BSOZvC+nDMemCEgQ2mOJkpT0CydWYluD5a9N2zvCho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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