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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f22fe95750c38573f90cc426089e8390fe37e97fc9b40a28c7e7f860ccf20e' 
  AND token = 'DhvpYDJknuXJ4ctUs3S33PzqMM+Q2r3EtN6J4tE4w+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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