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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313aada0d76ce9ba475f82424ba3389e8179c5c6ad031d39312a2a75ed0174b0' 
  AND token = 'HSQr4LOrbW5NoqC7ll4z2Oh8sbXYsUwfamFJ0NrCqNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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