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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3900e100b95f8749fd36eb5770323f2262b00740c959eb2812402df943011ed7' 
  AND token = 'v/KfFcrgYD3TtXmTLUrn2aUyj57fpi91YNd8Yn1myiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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