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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2b59efac124423dd76b459b9797e1d673651c0a3a086116568fc2e57b10bf4' 
  AND token = 'qFL6mBovU9eaguv1EvbRAGKtxMrVulbYlGcTl4uZFv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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