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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76af7c5c0772d5c7d38cf45215a6a1901c334767ee2d95cbbee20c4c195a3d3b' 
  AND token = 'EHq8dftqbfmcLuwGZ/bbtuuU/Ao29SnZbbra1aTdYMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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