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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6814a53e3e9d2ee4e4fc4daad94eb1118f200d789e2b930eec889b6eb660ac' 
  AND token = 'MW92XdDK4N1fRH2iHP/pCjS29WCAihRswRCLU4qUXs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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