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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2209400f0f8a89014e817d0b201a48064f5f185b622f0aedde9c923a2d6bac5b' 
  AND token = '3RkXm6txsk5wPCnxEQydT7LTpFpR64fl3vt5FoRVmAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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