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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e63176ed7a006ed36b0c18665505bd0e63af8488ea07ce540c0cfe45c3e6488' 
  AND token = 'uF99gX/K3EPKjMdKeLQ22HrjGe/Z8k8ZUYGmeYeyaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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