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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08ad89b98ad159146091bb93ba1eab0b9b0a1bc885f5c939ac88c0c95ee9731' 
  AND token = 'gfF6ZxBC5qIWw09TOuvj5RFVStgUAgkVeEwSjscWRbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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