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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903543951b3e5816b7690fd06ece95c886a3d743e33e4f1ecca9723446f060a2' 
  AND token = '+7/dXOh3jsozg2F2cMHyuPIXF7Nll/UiQjJiPJlHe4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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