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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360c6f7c65682f407a91b208aeec72570f2a01e22a95a6bdea31218a08e7abe3' 
  AND token = 'Wkc5zjT43IScNrLwzfBxIVkqda9MCqlHBH2lj315apM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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