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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc1a528d7db8ebce3e8054870ad096c293a32b065eafc7339ee22aa2435adca' 
  AND token = 'db8M02tMyUQQL9RLk1eyR5funq5sUp72Ndsrf/jpteQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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