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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b64a9790dcfaa5cb34828b06a2c4ab046640bc116b773f50246597b7aba7371' 
  AND token = '9pPZyFGXMyRCWgC14LHX7PISxP1RAhfYNNk4A8tAE0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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