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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef84dc3bc390fc8ffe9b1412041f3460906580ffa833885681baf0ad3f4c1fc' 
  AND token = '5h0ucgQMpA1duLTlu+XBe4vTMHE+EiWNAHzonT69Ytk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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