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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae1494629ec8a504a032c09f3273d2f635c84964248f52b84bf48444570bc26' 
  AND token = '6Rse5R2Q8vANGjkrdRHKTtAe9OxDfX5kfmeQBQUkcBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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