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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbbc01b1c37322dc3b70da6c4ed2c51f3bbf02489bf2d3a463af4afa5189193' 
  AND token = 'btCtXUvYOlfaF/UBAMO9SFamKES/rO3bfE+7mQS1ABk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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