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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cefc9a1573177ea6289669f96d1974728d5cdd45970fabfb5b4d844ca75400' 
  AND token = '0eDg0/86WY4YzHJZnyDAWt7nQ5YGBA1bvoell9A3evM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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