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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f770ab84b579b5a5f5eae3987ea7942a7a5ead49854b3d05491a7adeb52ec812' 
  AND token = 'BeJ4/ae8jmxkd93rjgPIoYwuMTNtAgqlYIMMqH+6lI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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