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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf44e5645e1a8a01d3691fefe98be4e26377d2d2c59887362cbeb6bda6a4a28' 
  AND token = 'BKwUQX2BoL6l5KqTBKdysU7OxRT2+6rEGdy65MA09ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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