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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bab3b88d3c713228411e2842d5274ab114bb9eee4d474947f6e201f605fb8b9' 
  AND token = 'YDxi9PWjMM5eC4VvJTUDJ14/xCv2s0mHKG3zHNJahGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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